Meri Suhartini
Center for Research and Development of Isotopes and Radiation Technology,National Nuclear Energy Agency of Indonesia (BATAN), Jl Cinere Pasar Jumat, Jakarta 12720, Indonesia,
Indonesia

Fumio Yoshii
Japan Atomic Energy Research Institute, Takasaki Radiation Chemistry Research Establishment, , Watanuki-machi, Takasaki, Gunma 370-1292, Japan.
Japan

Naotsugu Nagasawa
Japan Atomic Energy Research Institute, Takasaki Radiation Chemistry Research Establishment, , Watanuki-machi, Takasaki, Gunma 370-1292, Japan.
Japan

Hiroshi Mitomo
Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University, Tenjincho, Kiryu, Gunma 376-8515, Japan.
Japan